Plot Summary:

Trapped underground by a massive collapse, a crew of coal miners struggles for survival—and sanity.
Inspired by actual events: at a coal mine in a blue-collar town it’s the last day of work for veteran miner George Marsh (Jeff Fahey). His daughter Samantha (Kelly Noonan), a feisty environmental lawyer whose politics are bitterly opposed by her father, celebrates the occasion by accompanying him underground. She’s escorted by old flame Randy Bennings (Joey Kern); no sooner do they descend to the coal face, however, than a drilling machine malfunctions and punches through a supporting wall. A cave-in kills several workers and several others go missing. The crew foreman, Mundy (Brent Briscoe), is grievously injured.
The shocked survivors retreat to a claustrophobic rescue chamber. While they wait for surface workers to reach them they hear terrifying, almost-human sounds from the bowels of the mine. After arguing among themselves, they leave the chamber to discover the noises’ source. Their frenzied efforts find nothing—except evidence of a similar disaster more than 90 years ago.
Meanwhile: Samantha begins experiencing horrific visions. Several of the men panic, are separated from the group, and murdered-- gruesomely—by unseen assailants. As the air runs out and the death count rises, those who remain fight to separate their worst fears from reality.